A study published last week in JAMA Pediatrics reinforces a sobering reality: Far too many minors are gaining access to firearms and either committing suicide or accidentally killing themselves — or others. Last year more than 4,500 children age 17 or younger were killed or wounded with guns. While suicide statistics for 2018 aren’t available, the Centers for Disease Control and Prevention has reported a sharp rise in recent youth suicides, about half of which historically have involved a gun. But the new study also concluded that up to a third of accidental gun deaths and suicides among children could be avoided if the adults with whom they lived locked up their guns. “Results of this modeling study suggest that a relatively modest uptake of a straightforward safe storage recommendation — lock all household firearms — could result in meaningful reductions in firearm suicide and unintentional firearm fatalities among youth,” the study concluded. An earlier study found that only 30 percent of self-identified gun owners who lived with children safely stored their guns. Even people who should know better fail at such a basic safety step. Recently, a 4-year-old boy in Toledo found o...